CVE-2026-63940Critical· 9.3▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Ignore Port I/O requests of length '0' Explicitly ignore Port I/O requests of length '0' (or count '0'), so that setting up the software scratch area (and ot…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 51.2 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
Last analysed / modified upstream
0.2% → 0.2%
In the Linux kernel, the following vulnerability has been resolved:
KVM: SEV: Ignore Port I/O requests of length '0'
Explicitly ignore Port I/O requests of length '0' (or count '0'), so that setting up the software scratch area (and other code) doesn't have to worry about underflowing the length, and to allow for WARNing on trying to configure the scratch area with len==0.
Linux >= 291bd20d5d88814a73d43b55b9428feab2f28094 < bbd3a27e4f99fdcad82d12d79c04a95dff1ff70bLinux >= 291bd20d5d88814a73d43b55b9428feab2f28094 < 3b6035bc6bff20e89752ce4358bc4c9a9d5883f2Linux >= 291bd20d5d88814a73d43b55b9428feab2f28094 < 2254972d4d69e279ba4e87bf0968eb08ad0d3c92Linux >= 291bd20d5d88814a73d43b55b9428feab2f28094 < c30cde934c7813b4e3069765dac64ce3d31e34f2Linux >= 291bd20d5d88814a73d43b55b9428feab2f28094 < 3988bd2723de407ae90fa7a6f6029b4e60238c58Linux 5.11Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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